Transmit Admit Criteria - Motorola Commercial Series Selling Manual

2-10
A 'Re-Key inhibit duration' can be programmed, which prevents users from re-transmitting a
period of time after the TOT has expired. This prevents an individual user from 'hogging' the
channel.
A 'De-Key Telegram on TOT' can be programmed to send a telegram when the radio times out.
Benefits
Enforces efficient use of airtime.
Addresses accidental continuous keying.
Re-Key Timer stops users hogging the channel.
6.2

Transmit Admit Criteria

Transmit Admit Criteria automatically check the channel for activity and only allow the radio to
transmit if certain criteria are met. This enforces radio operational discipline and simplifies radio
operation. The Transmit Admit Criteria available are:
Never Allowed - This option prevents the user transmitting and operationally the channel is receive
only.
Always Allowed - This option allows the user to transmit at any time.
Channel Free - This option only allows transmission when carrier is not present.
PL/DPL Lockout - This option only allows transmission when carrier is not present, or
when carrier is present and the radio is detecting the PL decode frequency for the channel.
This option is required for the type of repeater that holds up both carrier and PL during repeater
hang time. Repeater hang time is the period of time during which the repeater remains keyed after a
user's radio has de-keyed. It is used to prevent other users with different PLs gaining access and
control of the repeater before a 'called' radio with the same PL has had a chance to reply.
Past PL/DPL Lockout - This option only allows transmission when carrier is not present, or
when carrier is present and the radio has detected the PL decode frequency for the channel since
carrier was detected.
NOTE Carrier is assumed to be lost when the radio is keyed, so this criterion must be
satisfied again after de-key.
This option is required for the type of repeater that only holds up carrier (not PL) during hang time,
but where the radios on the repeater use PL. It is used to prevent other users with different PLs
gaining access and control of the repeater during gaps in the conversation.
In this case the called radio, not receiving PL during the hang time, must remember that it did
receive the correct PL prior to hang time and is therefore able to transmit.
FEATURES AND BENEFITS